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Related Experiment Videos

Coupling-induced oscillations in overdamped bistable systems.

Visarath In1, Adi R Bulsara, Antonio Palacios

  • 1Space and Naval Warfare Systems Center, Code 2363, 53560 Hull Street, San Diego, California 92152-5001, USA. visarath.in@navy.mil

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 20, 2003
PubMed
Summary

Dynamical systems typically do not oscillate unless designed with specific coupling and initial conditions. This study shows how coupled ferromagnetic elements can be induced to oscillate, useful for detecting weak signals.

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Area of Science:

  • Physics
  • Dynamical Systems
  • Ferromagnetism

Background:

  • Overdamped and unforced dynamical systems are known not to oscillate.
  • Oscillations can be induced in such systems by specific coupling schemes and initial conditions.

Purpose of the Study:

  • To demonstrate the induction of oscillations in a hysteretic single-domain ferromagnetic sample using a designed coupling scheme.
  • To explore the potential application of these induced oscillations in signal detection.

Main Methods:

  • Utilizing a soft-potential mean-field description for ferromagnetic dynamics.
  • Implementing a unidirectional coupling scheme with cyclic boundary conditions for N (odd) elements.
  • Employing nonidentical initial conditions and sweeping a control parameter (coupling coefficient) through a critical value.

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Main Results:

  • Successfully induced oscillations in the coupled system of ferromagnetic elements.
  • Demonstrated that oscillations occur when the coupling coefficient exceeds a critical threshold.
  • Observed that oscillation characteristics are affected by the system's dynamics.

Conclusions:

  • Well-designed coupling and initial conditions can induce oscillations in systems that normally do not.
  • The induced oscillations in ferromagnetic systems offer potential for sensitive detection of weak target signals.